Method and system of marking a text document with a pattern...

Details Method and system of marking a text document with a pattern... Method and system of marking a text document with a pattern...

2005-09-06

2005-09-06

Smithers, Matthew (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C382S100000

Reexamination Certificate

active

06941460

ABSTRACT:
The invention discloses how a text document can be marked through the insertion of inter-word blank characters for the purpose of becoming authenticateable. First, text to be marked is edited so as to obtain a canonical form of it conforming to a model. Then, from this canonical form of the text and a secret-key used as inputs, a unique combination of inter-word blank characters positions is computed in which extra blanks are inserted thus, obtaining a marked text document. Authentication of a received marked text document is performed by a recipient, sharing the secret-key, further comparing the received text document to the marked text document so that if they are matching exactly the received text document is accepted as authentic or rejected as fake if not. The invention allows to merge the information necessary to authenticate a text document into the body of the document itself which works as well on soft-copy and hard-copy text documents.

REFERENCES:
patent: 5313564 (1994-05-01), Kafri et al.
patent: 5590258 (1996-12-01), Aoyama
patent: 5991403 (1999-11-01), Aucsmith et al.
Swanson et al; “Multimedia Data-Embedding and Watermark Technologies”, Jun. 1998, IEEE, vol. 86, No. 6, pp. 1064-1087.

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